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An irreversible swelling was detected in laminated beech veneer lumber within the initial moistening. Supported by the facts that the lay-up of the glued veneers is exposed to high pressure during hot pressing, and that the density of the finished material exceeds that of solid beech, it was hypothesised that the wood substance is compressed. Laboratory X-ray density profile scans were performed to check this and to identify the part of the material cross section in which the densification has taken place. The higher density was found to be located in the area of the adhesive joints, uniformly over the cross section, while the density in the middle of the veneers corresponds to that of solid beech wood.
Nick Engehausen; Jan Benthien; Martin Nopens; Jörg Ressel. Density Profile Analysis of Laminated Beech Veneer Lumber (BauBuche). Fibers 2021, 9, 31 .
AMA StyleNick Engehausen, Jan Benthien, Martin Nopens, Jörg Ressel. Density Profile Analysis of Laminated Beech Veneer Lumber (BauBuche). Fibers. 2021; 9 (5):31.
Chicago/Turabian StyleNick Engehausen; Jan Benthien; Martin Nopens; Jörg Ressel. 2021. "Density Profile Analysis of Laminated Beech Veneer Lumber (BauBuche)." Fibers 9, no. 5: 31.
Replacing greenhouse gas-intensive building materials with wood products from sustainable forestry contributes to the implementation of current climate conventions such as the Paris Agreement. Hardwood products, such as laminated veneer lumber made of beech (e.g., BauBuche), are an alternative to conventional building materials. For the application of wood products in the construction sector, a precise knowledge of the mechanical and physical properties is essential. Therefore, the aim of the present study was to investigate the sorption behavior and associated dimensional changes of the product BauBuche. This was done by applying a manual testing procedure (climatic chamber, balance and caliper) as well as a dynamic vapor sorption analyzer equipped with a camera. During initial moistening after production, due to the irreversible spring back (approximately 2 mm at 50 mm; i.e., 4%), Baubuche shows an extremely strong swelling in the radial direction. Once the maximum spring back is reached, Baubuche shows sorption behavior in the radial and tangential direction, which is comparable to that of solid beech wood in the radial direction. Consequently, the dimensional changes caused by moisture changes must be taken into account in the dimensioning of Baubuche components in order to avoid damage to building structures.
Jan T. Benthien; Martin Riegler; Nick Engehausen; Martin Nopens. Specific Dimensional Change Behavior of Laminated Beech Veneer Lumber (BauBuche) in Terms of Moisture Absorption and Desorption. Fibers 2020, 8, 47 .
AMA StyleJan T. Benthien, Martin Riegler, Nick Engehausen, Martin Nopens. Specific Dimensional Change Behavior of Laminated Beech Veneer Lumber (BauBuche) in Terms of Moisture Absorption and Desorption. Fibers. 2020; 8 (7):47.
Chicago/Turabian StyleJan T. Benthien; Martin Riegler; Nick Engehausen; Martin Nopens. 2020. "Specific Dimensional Change Behavior of Laminated Beech Veneer Lumber (BauBuche) in Terms of Moisture Absorption and Desorption." Fibers 8, no. 7: 47.